Boiler flue issues - basement and flue termination

[AlsPlumbing]

Any chance of running the flue internally, check your boilers MI's as you should be able to run the flue quite a distance horizontally before turning upwards.

Unfortunately not. My customer said his kitchen cupboards will sit over this spot.
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No no no ! You can't do that must be open all sides it can have a wire mesh guard fitted around the air intake . Kop

Cheers for reply.
Yes, I know this, but the terminal will be outside. It would be off a vertical flue with pitched flashing coming out from the 'cupboard pitched roof' only problem i think would have is the external wall distance, which i'm going to look up now. Anything more than 300mm, I'm probably stuffed! 🙈